In early phases of the software cycle, requirementsprioritization necessarily relies on the specifiedrequirements and on predictions of benefit and cost ofindividual requirements. This paper presents results ofa systematic review of literature, which investigateshow existing methods approach the problem ofrequirements prioritization based on benefit and cost.From this review, it derives a set of under-researchedissues which warrant future efforts and sketches anagenda for future research in this area.